RxJs: Как правильно сделать debounce?

...
import {debounceTime} from 'rxjs/operators';
...
  ngOnInit(): void {
    this.dataService.proc.subscribe({
      next: (proc) => {
        this.dataService.proc.pipe(
          debounceTime(500)
        ).subscribe(e => this.goToProc(proc));
      }
    });
  }

...
import {debounce } from 'rxjs/operators';
import { timer } from 'rxjs';
...
  ngOnInit(): void {
    this.dataService.proc.subscribe({
      next: (proc) => {
        this.dataService.proc.pipe(
          debounce(() => timer(500))
        ).subscribe(e => this.goToProc(proc));
      }
    });
  }